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A system parameter transmission method in a cognitive radio communication system

A technology of system parameters and transmission methods, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems such as long super-frame period, weak transceiver interaction ability, and inability to adapt to dynamic perception, etc., to simplify and complicate the design degree of effect

Inactive Publication Date: 2017-12-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

In some traditional communication protocols, the superframe period is long, which cannot adapt to dynamic perception; in the information transmission mode, the adaptive transmission complexity is high, and the interaction ability of the transceiver is weak

Method used

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  • A system parameter transmission method in a cognitive radio communication system
  • A system parameter transmission method in a cognitive radio communication system
  • A system parameter transmission method in a cognitive radio communication system

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Experimental program
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Embodiment Construction

[0045] The simulation platform will be constructed below, and the simulation result diagram will be given. System simulation parameters: the number of FFT points is 512, the CP length is 128, the main channel is QPSK modulation, the length of the 6th order kasami sequence is P=63, and the length of the 8th order kasami sequence is P=255. The real part and the imaginary part are divided into two ways of transmission, and the reception of additional information only considers one way of information. If the additional channel is direct-sequence spread spectrum, you can choose to truncate the PN sequence so that the additional information after spreading is consistent with the length of the OFDM subcarrier. Only the kasami sequence loading information is described in the following steps.

[0046] 1) Perform 1 / 4LDPC encoding and QPSK modulation on the main information.

[0047] 2) Assuming that the additional information has been coded with kasami sequences in advance, the kasami...

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Abstract

A system parameter transmission method in a cognitive radio communication system belongs to the technical field of wireless communication. The transmitter superimposes the main channel information and the additional channel information (system information) in the frequency domain based on OFDM technology, and transmits it after IFFT transformation and adding a cyclic prefix; the receiver de-cyclic prefixes and FFT transforms the received information After that, it first decodes to obtain the main information, then eliminates the main information from the received information, and finally demodulates the additional information. The additional information is coded using kasami sequences; on the premise of ensuring the reliability of the original service information (main channel), the transmission technology of superimposing information in the frequency domain (additional channel) realizes the system parameter transmission of the cognitive network and can adapt to dynamic Spectrum switching, simplifying the design complexity.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a system parameter transmission method in a cognitive radio communication system. Background technique [0002] With the increasing social demand, various wireless communication technologies are rapidly developing and applied in various fields of social life, and the shortage of spectrum resources is becoming increasingly prominent. However, studies have shown that some spectrum resources are still not fully utilized, there are a large number of idle frequency bands, and spectrum resources are seriously wasted. The emergence of cognitive radio technology (CR) provides an effective way to solve the problem of underutilization of spectrum resources, and has become a research hotspot in recent years. It can perceive the transmission parameters of the surrounding wireless environment (such as the operating frequency of authorized users and cognitive users,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L5/00
Inventor 刘光辉朱美松朱婧王艳艳
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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